Tube and protective sleeve assembly



De,18,1945. AL PARKER` 2,391,266

TUBE AND PROTECTIVEy SLEEVE ASSEMBLY Patented Dec. 18, 1945 a -1 AA-DlilidtionMareh 31, 1941, Serial No: 386,Z01

said ends between opposingfeoniformfmalejand mationfbf-eertainrfermslef yfmlpeflcou;

, portionrk thereof; and! the ,-tube. isfin. intimateawall to/Walle contact @Witha the f sleevezthroughoutethe .slightly flared yportion'..thereo '-ifWith. the .Lab ove; and: other; objectsicin.; View :that 5 Willihereinafterfappear;the'naturegofthezinven- .,ftionewillebermore.Lfullyuunderstoodcbyfollowing .5 the id'etailed.descrptionftheappendedeclaimmand the several views illustrated inztheaccompanying drawings. Y

`In the'v drawings: `-rFigure 1 isga ;central= longitudinali seetiorr`I ofea tube coupling embodying-Ltherinventi'on.

Eig-ure. 2 isA a, centralilongitudmah vsection-illustrating theitubexand; protective `:sleeve; e.`ssembly :.prior =to engagement of @opposed.'rwallfportions :'thereofandthe flaringcofithe tubeend.

.:Figurel isla central Vlongitudinalirv section illus- 'trating the: cornpletedi tubeand isleeve` assembly.

`rFigure- 4. ism a. central-tlogitudinal: sectio'nlillusf trating a modified form-of protective-sleeve.

z iFigurefds: ailongitudnalasectional; View illustrating :thermodied Z formfof :sleeveeas :loosely surrounding-thetube-endlwith zwhich-it is to be f, assembled. y :Figure 6:isa;:centraldongitudinahseetionf.illuss -trating the' tuberi and sleeve asipartiallyx assem- :f bled; they 'has/ing:-v been broughtA into Walletoewall Contact prior to the aring of the tube end. :Figure 7i is af'liew similar .to iligurerv l's'howing ingithe completed sleeveand 'tubeK assembly.Av

Thisiapplicatony isle'l continuation in4 part i of Ltheaapplicatonjir U'. ySil Letters Patent-Sert No. 205,102, 'ledaby Arthur ,LzkPar-ker FOnWApriIMSZQ, ,.l938.v Y* :Iniorden to:mereiclearlyillustrate the-'adapta- `f.tion'ofthe firnventionf, there Y is `illustrated kiifilig- :.urel aicomplete coupling-'inewhich one of the tube ...and sleeve; assembliesfembodying .thieeinvention is ,-.se.eu'rely clamped.

; In: the coupling;illustratedzimEigur@ 1,1 there .-fisglincluded a :malecouplingz member; 5;'zwhc`h indudes/agconiformi seat extensionI 6 presenting a tapered; clamping: surface 1 for engagement in the Y:aredg ends; 8; of.: 'ftheitubelz 9-1wh`ich :tis wto be 45 fclamped inr ther-coupling. ,-3 Theamale: member vis ,ftmaleff member, and -fitz-twil-l` beg; observed; aby; refer- #-ence'iitoii-the.said-?Figure 1"-lthat the bore" inlthe J.male;.member and thebore inftheptubetebe cou- 501Jfpled; are 1 of' isubstantiallyif i" the@ same diameter. ryJhe'iem-alefmember! comprises anutlor clampr .1. mer'nh'eri fl'l 'which-,is internally threaded, as .at-'5| 2,

-1 andalincludesl an 'abutment l 3 'formedl inan'VV -eX- tension I 4.:extending upwardly Qfromg said nut. 5v5 A clamp sleeved Ssurrounds the` tube? 931 within the nut I I and extends longitudinally beyond the nut extension I4 in the manner illustrated in Figure 1. This sleeve includes a lower enlargement I6 providing an abutment shoulder I1 adapted to be engaged by the abutment shoulder I3 of the nut and which has the lower end of its bore ared, as at I8, for engaging the flared end 8 of the tube 9. The external diameter of the sleeve enlargement I6 is smaller than the internal diameter of the receiving chamber within the nut II so as to provide a clearance I9.

The present invention resides in the provision of a novel sleeve and tube assembly in which the sleeve I and the tube 9 comprises an integrated unit to be clamped in a coupling the same in construction as or similar to the one illustrated in Figure 1.

In forming the assembly, the tube 9 and the relatively thin, ilexible protective sleeve I5 which surrounds the same in close relation are loosely assembled in the manner illustrated in Figure 2, after which the opposing walls of the tube and sleeve are brought into permanent intimate contact, as at 29, throughout a portion only of the length thereof commencing at the sleeve flare I8. This Wall-to-wall contact is preferably brought about by expanding the tube 9 by employment of any suitable expanding tube, preferably one such as is illustrated in the parent application herebefore referred to and of which this application is a continuation in part. y

By bringing about permanent intimate wallto-wall contact between the tube 9 and the sleeve I5 throughout a portion only of the length of the sleeve, the tube is Very slightly spaced from the sleeve, as at 2I, a distance below the free extremity of the sleeve, this spacing gradually diminishing as it approaches the commencement of the wall-to-wall contact between said tube and sleeve. In this manner Vibrations set up in the coupled tube are gradually dampened.

It is also preferred that the ,free end of the tube I5 be angle cut, as at 22, so as to distribute longitudinally tube vibrations occurringi at this point rather than to localize such vibrations at a single line extending transversely-about the tube.

Tests have shown that when the tubes are loose withinand surrounding the sleeves throughout the whole length of the sleeve commencing at the clamped flare of the tube, vibrationsset up in the coupled tubes frequently break the tubes at the base of the ilare. It has been found also that when the tubes are brought into intimate Vcontact with the sleeves throughout the whole v rounding sleeve throughout a portion only of theA length of the sleeve, as indicatedvat 20, the Vibra-i tions in the coupled tube are gradually `dampened and tube breakage is reduced to an absolute minimum. In other Words, the sleeve of Fig- .,ure 3 avoids abrupt checking or dampening of the tube vibrations by being Vlong and thin and thus denitely flexible at the outer or free end, with a gradually increasing rigidity toward the inner or clamped end so that the tube vibrations will be gradually dampened over a substantial U part of the tube and sleeve area. f

In Figures 4 through 7 there is illustrated a `Figures 6 and 7 of the drawings.

modified form of the invention in which the sleeve 23 includes a head enlargement 24 providing an abutment shoulder 25, and which is ared, as at 26, to oppose the tube flare. In this modied form of the invention the sleeve 23 is slightly flared, as at 21, throughout a portion of the length thereof commencing at aY distance below the upper or free end of the sleeve, as clearly illustrated in Figure 4, and terminating at' or merging into the enlargement are 26.

The tube 28 in this form of the invention is `,expanded into permanent intimate wall-to-wall contact with the whole of the slightly tapered portion 21 of the sleeve 23, and above the engaging wall portions of the tube and sleeve there is provided 'a gradual clearance, as indicated at 30, extending down a considerable distance from the angle cut free end 3l of the sleeve. It will be observed that theslight flare of the tube extends slightly above themter-minus of the slight are inthe sleeve in the mannerbest illustrated in v The end of the( tube 28 is flared into permanent intimate contact with the sleeve flare 2 6, as indicated at 32 in the completely assembled unit illustrated in Figure `'1.

All of the advantages stressed in connection with the form of the invention illustrated in Figures 1 to 3 of the drawings are provided in the modied form of the invention illustrated in Figures 4 through 7, and, in addition, the flaring of the sleeve and tube, as at 21, 29, further assures against pulling out'l of the tube 28 under use strainswhile coupled in a coupling of the nature lillustrated in Figure 1. l

It is of courseto be understood that the details of structure and arrangement of parts may be variously changed ,and modified without departing from-the spirit and scope of my invention.

I claim: y

Y 1. A tube element assembly comprising a metal tube to be coupled, and a thin flexible metal protective sleeve4 surrounding said tube at one end and including a flared portion opposed to the end portion of the tube, opposed wall portions of said tube and sleeve being engaged in `per manent intimate wall-to-wall contact, and said tube being flared against the flare of the sleeve, said permanently and intimately engaged. wall portions extending throughout a substantial portionxof but less thanthe whole length of the sleeve commencing at the-flared portion, thereby to gradually dampen vibrations set up in said tube when secured in a coupling.

2. A tube element assembly comprising a metal nent intimate wall-to-.wall contact, and saidA tube being flared against the flare ofthe sleeve, said-permanently and intimately engaged Wall portions extending throughout a substantial portion of but less than the Whole length of the sleeve commencing at the flared portion, thereby to gradually dampen vibrations set up in said tube Y when secured in a coupling, and said sleeve tertube to be coupled, and a thin iiexible metal protective sleeve surrounding said tube at one end and including a dared portion opposed to the end portion of the tube, opposed wall portions of said tube and sleeve being engaged in permanent intimate wall-to-wall contact, and said tube being flared against the are of the sleeve, said permanently and intimately engaged wall portions extending throughout a substantial portion of but less than the Whole length of the sleeve commencing at the flared portion, thereby to end portion of the tube. opposed wall lportions of said tube and sleeve being engaged in permanent intimate wall-to-wall contact, and said tube being flared against the nare of the sleeve, said permanently and intimately engaged Wall portions extending throughout a substantial portion of but less than the whole length of the sleeve commencing at the liared portion, thereby to gradually dampen vibrations setup in said tube when secured in a coupling, and said sleeve including a slightly :dared portion forming at least a part of the .Wall portion thereof which is in permanent and intimate contact with the tube, and said tube being slightly flared throughout the length of the slightly ared sleeve portion and for a portion of i'ts length therebeyond thereby to facilitate the gradual dampening of said vibrations. l

ARTHUR L. PARKER. 

